WOW!
Respect! 
Thank you.
I am also Loxone user and I plan to realize intercom - not with iButton, but with fingerprint scanner (https://www.aliexpress.com/ite…=2114.13010608.0.0.rYIuTT).
But I am "do-it-yourself man" beginer. 
I can't wait to see your detailed step-by step guide!!!
Once again thanks!
Marek